ig r ) The Scottish Naturalist. 



one of the three leaflets is affected, sometimes two. These 

 galls are very common at Old Aberdeen. 



Prunus communis Huds. — (a) Galls very much like those on 

 P. padus, but stouter. 



Spiraea ulmaria L. — The maker of the galls on this plant is 

 Cecidomyia tdmarice, Bremi. They are cone-shaped, the 

 apex projecting below the leaf; colour usually green or 

 yellowish. 



Quercus robur L. — In December last, while visiting Dr. Buch- 

 anan White in Perth, we found several galls on oaks, on 

 Kinnoul Hill, distinct from those which I have found in the 

 Aberdeen district, and I therefore subjoin their descriptions, 

 premising that these are taken from the dry galls. (^"Silky- 

 button gall," on the under surface of the leaves, several 

 being on each leaf. They are of small size, round, depressed 

 considerably above, and flattened below, and present a 

 silky appearance, being covered with silky hairs lying 

 flat along the sides, from above downwards, like a silk 

 covered button. Structure woody and monothalamous, the 

 walls being thinnest next the leaf. Formed by Neuro- 

 terus mimismatis, Oliv. (e) The oak-spangle galls were 

 very common on the under surfaces of oak leaves. They 

 are round, seldom over ^-inch in diameter, and form a 

 very low cone, the margins being almost flat. The gall is 

 covered over with tufts of reddish brown pubescence on its 

 outer surface ; and has a single very shallow cell. The 

 maker is Neuroterus lenticularis, Oliv. 



In addition to these I also got several galls about the size of 

 "marbles" on twigs of young oaks on Kinnoull, and which seem 

 to belong to two or three different species, but as I am in some 

 doubt about them, I refrain from describing them till the 

 insects emerge. 



The following list enumerates the species which form some 

 of the galls formerly described by me, as far as I have, been 

 able to identify them : — On Rosa spinosissima L., by Rhodites 

 spinosissitnce. On Rosa canina L. (a) Bedeguar, by Rh. rosce 

 L. ; (d) by Rh. cglaiitcriai H. On Hicracium borcalc Fries., by 

 Aulax sabaudi H. On Fraxinus excelsior L., by Diplosis 



